Answer Posted / awadhesh tiwari
A CSU/DSU (Channel Service Unit/Data Service Unit) is a
digital-interface device used to connect a Data Terminal
Equipment device or DTE, such as a router, to a digital
circuit (for example a T1 or T3 line).
A CSU/DSU operates at the physical layer (layer 1) of the
OSI model. CSU/DSUs are also made as separate physical
products; CSUs and DSUs. The DSU or both functions may be
included as part of an interface card inserted into a DTE.
If the CSU/DSU is external, the DTE interface is usually
compatible with the V.xx or RS-232C or similar serial interface.
Digital lines require both a channel service unit (CSU) and
a data service unit (DSU). The CSU provides termination for
the digital signal and ensures connection integrity through
error correction and line monitoring. The DSU converts the
data encoded in the digital circuit into synchronous serial
data for connection to a DTE device.
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